PHP code example of qaribou / immutable.php

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

qaribou / immutable.php example snippets

use Qaribou\Collection\ImmArray;
$polite = ImmArray::fromArray(['set', 'once', 'don\'t', 'mutate']);
echo $polite->join(' ');
// => "set once don't mutate"

$yelling = $polite->map(function($word) { return strtoupper($word); });

echo <<<EOT
<article>
  <h3>A Wonderful List</h3>
  <ul>
    {$yelling->join('<li>', '</li>')}
  </ul>
</article>
EOT;

// => <article>
// =>   <h3>A Wonderful List</h3>
// =>   <ul>
// =>     <li>SET</li><li>ONCE</li><li>DON'T</li><li>MUTATE</li>
// =>   </ul>
// => </article>

echo 'Os in front: ' .
    $yelling
        ->sort(function($word) { return (strpos('O', $word) === false) ? 1 : -1; })
        ->join(' ');
// => "Os in front: ONCE DON'T MUTATE SET"

echo 'First 2 words only: ' . $polite->slice(0, 2)->join(' ');
// => "set once"

// Big memory footprint: $fruits is 30MB on PHP5.6
$fruits = array_merge(array_fill(0, 1000000, 'peach'), array_fill(0, 1000000, 'banana'));

// Small memory footprint: only 12MB
$fruitsImm = ImmArray::fromArray($fruits);

// Especially big savings for slices -- array_slice() gives a 31MB object
$range = range(0, 50000);
$sliceArray = array_slice($range, 0, 30000);

// But this is a 192 _byte_ iterator!
$immSlice = ImmArray::fromArray($range)->slice(0, 30000);

// Yes, we have no bananas
$noBananas = $fruitsImm->filter(function($fruit) { return $fruit !== 'banana'; });

$ia = ImmArray::fromArray([1,2,3,4]);
$ib = ImmArray::fromArray([5,6,7,8]);

// Like slice(), it's just a little iterator in-memory
$ic = $ia->concat($ib);
// => [1,2,3,4,5,6,7,8]

$fruits = ImmArray::fromArray(['peach', 'plum', 'orange']);

$fruits->reduce(function($last, $cur, $i) {
  return $last . '{"' . $i . '":' . $cur . '"},';
}, '"My Fruits: ');

// => My Fruits: {"0":"peach"},{"1":"plum"},{"2":"orange"},

$fruits = ImmArray::fromArray(['peach', 'plum', 'banana', 'orange']);

$fruitILike = $fruits->find(function ($fruit) {
  return $fruit === 'plum' || $fruit === 'orange';
});

// => 'plum'

echo $fruits[1];
// => "plum"

count($fruits);
// => 3

foreach ($fruits as $fruit) {
    $fruitCart->sell($fruit);
}

$vegetables = ImmArray::fromItems($vegetableIterator);

echo json_encode(
    ['name' => 'The Peach Pit', 'type' => 'fruit stand', 'fruits' => $noBananas]
);
// => {"name": "The Peach Pit", "type": "fruit stand", "fruits": ["peach", "peach", .....

class FooFixed extends SplFixedArray {}
$foo = FooFixed::fromArray([1, 2, 3]);
echo get_class($foo);
// => "SplFixedArray"

class FooFixed extends ImmArray {}
$foo = FooFixed::fromArray([1, 2, 3]);
echo get_class($foo);
// => "FooFixed"

$foo = ImmArray::fromArray([1, 2, 3, 4, 5]);
echo $foo->map(function($el) { return $el * 2; })->join(', ');
// => "2, 4, 6, 8, 10"

$foo = SplFixedArray::fromArray([1, 2, 3]);
echo json_encode($foo);
// => {"0":1,"1":2,"2":3}

$foo = ImmArray::fromArray([1, 2, 3]);
echo json_encode($foo);
// => [1,2,3]

$foo = new ImmArray();
$foo[1] = 'bar';
// => PHP Warning:  Uncaught exception 'RuntimeException' with message 'Attempt
to mutate immutable Qaribou\Collection\ImmArray object.' in
/project/src/Collection/ImmArray.php:169

// Make 100,000 random strings
$bigSet = ImmArray::fromArray(array_map(function($el) { return md5($el); }, range(0, 100000)));

// Time the map function
$t = microtime(true);
$mapped = $bigSet->map(function($el) { return '{' . $el . '}'; });
echo 'map: ' . (microtime(true) - $t) . 's', PHP_EOL;

// Time the sort function
$t = microtime(true);
$bigSet->sort(function($a, $b) { return strcmp($a, $b); });
echo 'mergeSort: ' . (microtime(true) - $t) . 's', PHP_EOL;

map: 0.30895709991455s
mergeSort: 6.610347032547s

map: 0.01442813873291s
mergeSort: 0.58948588371277s